Money exploit

[tim260]

- PC/Mac/PS4/XB1: Probably happening on all platforms
- Vehicle/Tool/Model/Object: Liquid pallets (probably also solid Fert etc)
- Issue: Same sell price as when it's full even when there is just '1' as fill level in it.
- Single- or Multiplayer: MP
- Steps to reproduce: Fill up a fertilizer implement and unload next to sell point. Then keep filling as low as possible (making as many pallets as possible) in the sell point. Then sell all pallets at full price.
- Does it happen on a standard map without mods yes/no: yes